Consider the three forces acting at O and in equilibrium as shown in the figure. Which of the following equations is/are CORRECT?

I. P₁ cos θ₁ = p₁ cos θ₂
II. P₃ = P₁ cos θ₄ + P₂cos₂
III. P₁sinθ₁=P₂sinθ₂

A. I only
B. II only
C. III only
D. I, II and III only

Correct Answer:

Option C = III only